Electron discharge device



Feb. 14, 1950 w. c, BROWN 2,497,436

ELECTRON DISCHARGE DEVICE Filed April 26, 1947 /2 38 37] 45 48 39 45 I S /8 .5" m

a ll I6 5 I5 26 4 4 I I3 48 23 N 22 36 3O F'IG./

33 j 5 II} 48 l H, II 35 /NVENTOR l/V/LL/AM C. BROWN A TTORNEY Patented Feb. 14,1950

William C. Brown, Lincoln, Mass., assignor to Raytheon Manufacturing Company, Newton, Mass., a corporation of Delaware Application April 26, 1947, Serial No. 7 44,087

This invention relates to electron discharge devices having a plurality of cavity resonators,

and more particularly to those for generating oscillations for short Wave length.

One of the objects of the present invention is to provide a device of the type referred to which shall have improved pole pieces, the construction of which represents a considerable s'aving in the cost of assembly and material.

Other and further objects and advantages of the present invention will become apparent, and

the foregoing will be, understood in relation to the following exemplification thereof, reference being had to the drawing in which:

Kg. 1 is a central, longitudinal section of an electron discharge device incorporating an i1lus-' trative embodiment of the present invention;

Figs. 2 and 3 are exploded partial perspective views of the present invention; and

Fig. 4 illustrates a modification of the illustrative embodiment of Fig. 1.

Referring now more particularly to Fig. 1, the

numeral It! represents an electrically-conductive tubular member, preferably of copper, which together with-a plurality of vanes or anode arms. II make up the anode structure of an electron discharge device known as a magnetron. Said anode arms are preferably made of copper. Ex-

tending outwardly from said tubular member lll Surrounding said annular portions l2l 3 is a second tubular mem-' are annular portions l2-|3.

ber 14, preferably of copper, which, combined with said first-named tubular member Ill, forms a hollow cooling jacket. Attached to a pair of apertures I5-I6 in said second-named tubular member M are threaded nipples ll-l8 adapted to be attached to a source of cooling liquid to be circulated within the jacket formed by tubular members In and I4. r

The annular portion I2 is gradually tapered and to said tapered portion is sealed a vitreous dome l9. To the lower annular portion I3 is attached a laminated pole piece preferably of steel and consisting of a plurality of dishlike members 2 l-23, so designed as to nest one within the other. The members 2I--22 are provided with apertures 24, see Fig. 3, while the member 23 is provided with an aperture 25 which has been upset to provide a shallow annular shoulder 26. Surrounding and attached to said lastnamed shoulder 26 is a third tubular member 21, preferably of a metal having the property of being readily sealed to any vitreous material such as glass. The other end of said tubular member 21 is hermetically sealed to a short length 6 Claims. (01. 250--27.5)

I of glass tubing 28, which in turn is fastened to Preferably, said ferrule is made a ferrule 29. of the same material as the member 21 and is attached to a cathode lead-in structure 30, said lead-in structure supporting an electron-emissive cathode 3|, positioned intermediate and parallel the edges 32 of the anode arms ll, said lead-in and cathode 3| being made accessible to the interior of the tubular member via the apertures 24-25 of the pole piece 20. v

The member 30 is attached to an annular member 33, said last-named member being attached to a second length of glass tubing 34 which in turn is connected-to a second ferrule 35, said ferrule being attached to an inner cathode leadin 36. Preferably the annular members 33 and 35 shall be of the same material as the member 2! while the inner cathode lead-in 36 may be.

made of tungsten.

Since both inner and outer lead-in conductors 30 and 36 together with the pole piece 20 are hermetically sealed to said tubular member 10, they form, in combination with the vitreous dome 19', a hermetically sealed enclosure.

Within said enclosure and disposed opposite said pole piece 20 is a second pole piece 31, consisting of similar dishlike members 38-40 of similar material and having apertures 4l--42 see Fig. 2, the member 40 having its aperture 42 upset to form an annular shoulder 43, extend ing upwardly from the dishlike configuration of said member 40. The last-named apertures provide the necessary space for the upper supporting member 44 of the cathode 3|.

--The pole piece 31 is, for example, silver-soldered within the annular portion l2 of the tubular:

member In, said pole piece having a plurality of apertures 45 in the inclined portion thereof for the extension therethrough of a plurality of prongs 46. rality of anode arms H, the opposite ends of said prongs terminating in a dome-like member;

41 which functions as an electromagnetic radiator of energy. conducted thereto from the cavity resonators not shown formed by the wall of the. tubular member l0 and theanode arms ll at-' Said prongs are attached to a plu is negligible and can be discounted. However, a modified embodiment is shown in Fig. 4 which serves to overcome the last-named situation completely and which will be discussed in connection with said figure.

In Figs. 2 and 3 the pole piece is illustrated in an exploded view. The various parts 2l-23 and 38-4B arestamped' out in'ithe desired shape and then nested one within the otherand -br-azed or welded together as desired.

The apertures 24 in the members 2|-22 are made sufficiently large to slip overthe tubular member 21. In stacking this particular group of members, it would be preferable :to weld or braze the tubular memberAZ-T .to the annular shoulder 26 first and then slip the members 20-42 over said tubular member .2?! and ,braze or weld them in place. The apertures 4| in the members 38 are of a size sumcient to accommodate the upset portion 43 of the member 40.

.Althoughon'ly one aperture 45 is shown in each of the inclined portions of members 4l-42, it shouldbe understood that the number of such apertures is determined by the number of prongs 46 .extending from the energy-transferring mem her 41..

Fig. 4 illustratesa modification of the embodiment shown in Fig. ,1. In this particularembodiment, the lips 49 of the members of the pole pieces at and.311:are extended beyond the tubular member 14. :Said pole pieces are assembled :in the same manner hereinbefore described .and are then attached to the respective open ends of the tubular members ill and M, for

example, by silver soldering .or other suitable been selected for the purpose of setting forththe principles involved. ,It will be obvious, however, that the invention may .be modified to meet various conditions which may be encountered in difierent specific uses,,=and it is therefore intended tO'zCO-Vfi' by the appended claim-s allsuch :modifications which fall within the of this invention.

' What is claimed is:

1. An electron discharge device comprisingza. tubular member; and a laminatedpole piECeZdiS- posed in said tubular member; said .pole piece including a plurality of nested, dishelikestampings having centrally apertured bottom Walls; the bottom wall of one of said stampings being upset and forming anannular-shoulder axiallyialigning the remaining stampings.

2. An electron discharge device comprising: a tubular member; and a laminated pole piece disposed in said tubular member; said pole piece including a plurality of nested, dish-like stampings having centrally apertured bottom walls and flanged portions extending exteriorly of said tubular member from the side walls thereof; the bottom 'wall of-one of said stampings being upset and forming an annular shoulder axially aligning the remaining stampings.

:33. An electron discharge device comprising: a tubular member; and a pair of laminated pole pieces disposed'at opposite ends of said tubular anemberyeach of said pole pieces including a plu- U reality-of nested, dish-like members having centnaillyapertured bottom walls and integral lips spirit and scope extending exteriorly of said tubular member from the side walls thereof.

d. .An electron discharge device comprising: a tubular member; and a pair of laminated pole pieces disposed-at opposite .ends of said tubular member; .eachof said pole pieces including a plurality of nested, dish-like members having centrally apertured bottom walls and integral lips extending exteriorly of said tubular member from the side walls thereof; one of the dish-like membersof eachof said pole pieces having its bottom wall upset and forming an annular shoulder.

axially aligning the remaining dish-like members.

'5. An electron discharge device comprising: a tubular member; a plurality of anode arms extending inwardly from said tubular member; a

laminated pole piece extending inwardly from said tubular member and being disposed adjacent said (anode arms; and anelectrically conductive member connected to .one of said anode arms;

said pole piece .being apertured to permit the passage therethrough of said electrically conductive member.

'6. An electron discharge device comprising: a cathode; .an anode structure, spaced from said cathode, and incorporating a cavity resonator;

an output device coup-led to said cavity resonator; and a pair of laminated pole pieces extending inwardly from said anode structure on' opposite .sides of said cavity resonator; both of said pole pieces being centrally apertured to accommodate said cathode, and one of said pole pieces being additionally apertured to permit the passage therethrough of said output device.

WILLIAM C. BROWN.

' REFERENCES .CITED The following references are of record in the filezof this patent:

UNITED STATES PATENTS McArthur Dec. 17,1946" 

